panic when importing file with quote

### Bug Description

At least panic on slintpad:

``` 
panicked at internal/compiler/typeloader.rs:1158:21:
Just loaded document not available
```


### Reproducible Code (if applicable)

```slint
import { XX } from "/ddd\"dd";
```

### Environment Details

Slint Version: 1.17.1
Tested on  Slintpad only so far.



### Product Impact

_No response_